LTC2917/LTC2918

5

29178f

SYMBOL

PARAMETER

CONDITIONS

MIN

TYP

MAX

UNITS

Reset Output (⎯R⎯S⎯T)

Internal Reset Timeout Period

●

150

200

260

ms

Adjustable Reset Timeout Period

●

16

20

25

ms

VM Undervoltage Detect to ⎯R⎯S⎯T

Asserted

VM Less Than Reset Threshold

●

10

80

150

μs

●

●

●

0.15

0.15

0.05

0.4

0.3

0.2

V

V

V

⎯R⎯S⎯T Output Voltage High Leakage

●

±1

μA

Watchdog Timer Control (WT)

WT Pull Up Current

●

–2

–3

–4

μA

WT Pull Down Current

●

234

μA

WT Internal Timer Threshold

●

–100

–160

–300

mV

●

18

μA

Watchdog Disable Hold Current

–3.5

μA

Watchdog Input (WDI)

Internal Watchdog Upper Boundary

●

1.3

1.6

2

s

Internal Watchdog Lower Boundary

(Note 5)

●

37.5

50

62.5

ms

External Watchdog Upper Boundary

●

130

160

200

ms

External Watchdog Lower Boundary

(Note 5)

●

ms

Input Low Voltage

●

0.4

V

Input High Voltage

●

1.1

V

Input Pulsewidth

●

400

ns

WDI Leakage Current

●

±1

μA

Manual Reset Input (LTC2918)

Input Low Voltage

●

V

Input High Voltage

●

V

Pull Up Resistance

●

50

100

150

kΩ

Pulsewidth

●

250

ns

Note 1: Stresses beyond those listed under Absolute Maximum Ratings

may cause permanent damage to the device. Exposure to any Absolute

Maximum Rating condition for extended periods may affect device

reliability and lifetime.

Note 2: All currents into pins are positive; all voltages are referenced to

GND unless otherwise noted.

which exceeds 5.7V may exceed the rated terminal current. Operation

from higher voltage supplies requires a series dropping resistor. See

Applications Information.

Note 4: Input impedance is dependent on the configuration of the SEL

pins.

Note 5: In the LTC2917-B/LTC2918-B, edges must occur on WDI with a

period between the lower and upper boundary or ⎯R⎯S⎯T is invoked. For the

LTC2917-A/LTC2918-A, the edges must simply occur before the upper

boundary. See Applications Information.